Error Messages

Error Messages

The Web browser supports the following HTTP standard Error Messages. The 4xx Status Codes indicate a client error in which the request contains bad syntax or cannot be fulfilled. The 5xx Status Codes indicate a server error in which the server failed to fulfill an apparently valid request.

Table 9: HTTP Error Messages
Status Code	Failure Message	Meaning
400	Bad Request	The request could not be understood by the server due to incorrect syntax.
401	Unauthorized	The request requires user authentication. This message triggers display of the HTTP Authentication screen.
402	Payment Required
403	Forbidden	The server has indicated it will not respond to your query.
404	Not Found	The server has not found anything matching the request.
405	Method Not Allowed
406	Not Acceptable
407	Proxy Authentication Required	The request requires user authentication. This message triggers display of the HTTP Authentication screen.
408	Request Time-out
409	Conflict	The request could not be completed due to a conflict with the current state of the resource.
410	Gone	The requested resource is no longer available.
411	Length Required	The server refuses to accept the request.
412	Precondition Failed
413	Request Entity Too Large	The server refuses to accept the request because the request entity is too large.
414	Request-URI Too Large	The request-URI is longer than the server can interpret.
415	Unsupported Media Type	The server refuses to accept the request because it is in an unsupported format.
416	Requested range not satisfiable
417	Expectation Failed
500	Internal Server Error	The server encountered an unexpected condition that prevented it from fulfilling the request.
501	Not Implemented
502	Bad Gateway	The server, while acting as a gateway or proxy, received an invalid response from the upstream server it accessed attempting to fulfill the request.
503	Service Unavailable	The server is currently unable to handle the request due to a temporary overload or maintenance.
504	Gateway Time-out	The server, while acting as a gateway or proxy, did not receive a timely response from the upstream server specified.
505	HTTP Version not supported	The server does not support, or refuses to support, the HTTP protocol version used in the request message.

NOTE: When the client server receives a Status Code 431, it safely assumes there was something wrong with its request and treats the response as if it had received a Status Code 400.